Gang-saw hook and stirrup



(No Model.)

0. P. ROSE. GANG SAW HOOK AND STIRRUP.

No. 432,567. Patented July 22, 1890.

Fig 7. r 73' .2.

, 5 v a I TERS co, Moro-mum, WASHINGTON n c UNITED STATES PATENT OFFICE.

CHARLES P. ROSE, OF MUSKEGON, MICHIGAN.

GANG-SAW HOOK AND STIRRUP.

SPECIFICATION forming part of Letters Patent No. 432,567, dated July 22,1890.

Application filed November 30, 1889. Serial No. 332,132. (No model.)

To all whom it may concern:

Be it known that I, CHARLES P. ROSE, a citizen of the United States,residing at M uskegon, in the county of Muskegon and State of Michigan,have invented certain new and useful Improvements in Gang-Saw Hooks andStirrups; and I do hereby declare the follow ing to be a-full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in gan g-saw hooks and stirrups,the object of the invention being to overcome the ordinary defects thatexist in gang-saw hooks as now constructed, and to produce a gang-sawhook having peculiar advantages, pro-eminent among which will be astronger connection between the hook and the stirrup, which will enablesaws to be put in perfect order for sawing lumber with considerable lesstension than has heretofore been done with any other kind.

of hook. 7

Another advantage gained by my improved construction will be a reductionin the cost of manufacture.

The invention consists, essentially, in an improved construction of thelower end of the stirrup, which is made of a circular form and adaptedto fit exactly within a circular opening in the upper end of the hook,by which arrangement the hook is allowed to oscillate to some extent onthe lower end of the stirrup, and also the hook is permitted to bedetached from the stirrup without taking the whole gang of saws apart.

The invention furthermore includes certain peculiarities in theconstruction, arrangement, and combination of parts, substantially aswill be hereinafter more fully described, and pointed out in the claim.

In the accompanying drawings, illustrating my invention, Figure l is afront View of my improved combined stirrup and hook for the upper end ofgang-saws in gang-saw mills. Fig. 2 is a side elevation of the same,together with the upper girder ofthe gate, which is shown incross-section, and the keys for straining the saw. Fig. 3 is a detailedge view of a portion of the saw, with the tabs attached to the upperend of the same.

Similar letters of reference designate corresponding parts in all thefigures.

A denotes the upper or top girder or bar of a gang sawing machine. Thisgirder is represented in cross-section in Fig. 2. Its upper surface islined the entire length with steel strips a. The girder and its liningare the same as are commonly used in gang-saw mills, by means of whichlogs or cants are simultaneously cut into a series of boards whilepassing through the machine, and therefore in this case I have merelyrepresented and described the upper girder and-its lining for the sakeof bringing out more clearly and definitely the leading features of mypresent invention.

B denotes a stirrup, the upper end of which is slotted, as shown,through which slot passes a keyl). The upper end of the stirrup is alsoprovided with a gib Zr. Thus it will be seen that the upper end of thestirrup does not differ essentially in its construction from stirrups incommon use. The lower end of the stirrup B is made circular or rounding,as at C, and is of the same-width as the hook D, which carries the upperend of the saw. This feature of the circular-ended stirrup connected tothe hook D constitutes one of the points of my invention.

The hook D is made in'the usual manner in two pieces, which are rivetedtogether by means of the rivets f. It is provided with the usual slots Eand e, which are adapted to receive the saw. The upper end of the hookD, however, is provided with a circular opening extending the full widthof the hook and adapted to receive the lower circular end 0 of thestirrup B, which circular end 0 is fitted nicely into the circularopening in the hook.

The opening in the upper portion of the hook is a little wider than theneck 0 of the stirrup. (See Fig. 2.) This is in order to allow the hookto oscillate a certain distance on'the clined lower edges of the slot Ein the hook B, which slot, as we have already seen, is adapted toreceive the upper end of the saw and the tabs carried thereby.

As is well known, a gang sawing machine has what is called a gate,consisting of an upper and lower girder firmly secured together, saidgate carrying a series of saws, the lower ends of the saws beingprovided with tabs in exactly the same manner as shown on the upper endof the saw-section G in Fig. 3. These tab-provided ends of the saws areheld in place on hooks attached to the lower girder, the upper ends ofthe saws being attached to the upper girder, as shown in Fig. 2.Therefore it will be observed that each saw is hung between an upper andlower book. The whole series of saws are then strained to a severetension by means of keys I) on top of the uppergirder. Thus it will beobvious that when the strain is put upon the saws the tabs willinvariably not bear across the whole length of the hook. More especiallywill this difiiculty occur when the saw is overhung on the top from avertical line, thus throwing the greatest strain on that on d of thehook nearest the teeth or front of the saw. \Vith my improvedconstruction, however, the oscillation of the hook allows of an equalstrain throughout the whole width of the hook. The result of this willbe to keep the angular lips of the slot which is located in the hook ina perfectly-straight line; hence by my improved construction of thestirrup and hook the 1nmber can be manufactured more perfectly, and thishas been demonstrated by actual experimen t.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The herein-described gang-saw hook and stirrup, consisting in thecombination of the upper girder A, the stirrup B, slotted at its upperend and having gib b, and also having neck 0 and the lower circular end0, the key I) for straining the saw, the hook D, formed in two parts andslotted at E e, and having its upper end provided with a circularopening to receive the circular end of the stirrup, and a saw having theangular tabs it it hung in the hook, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES P. ROSE. \Vitnesses:

ROBERT WEIR, D. J. MonIAR'rY.

